Analog-to-digital converter and analog-to-digital conversion method

Abstract

An analog-to-digital converter is characterized by comprising an M-bit delta modulation analog-to-digital converter for performing high-order M-bit quantization on an input analog signal in order to convert the input analog signal into a high-order M-bit quantized code value; and a N-M-bit successive approximation analog-to-digital converter for performing low-order N-M-bit quantization on the input analog signal to convert the input analog signal into a low-order N-M-bit quantized code value, merging the M-bit high-order digital code value and the N-M-bit lower-order digital code value into an N-bit digital signal and outputting the N-bit digital signal, wherein M and N are both integers greater than or equal to 1 and N is greater than M. The analog-to-digital converter combines an [sigma][delta]ADC with an SAR ADC, and has the advantages of high speed and small area on the basis of high precision.

Description

technical field [0001] The invention relates to the field of integrated circuit design, in particular to an analog-to-digital converter and an analog-to-digital conversion method. Background technique [0002] With the rapid development of semiconductor manufacturing technology, analog-to-digital converters (ADCs) have been widely used in various fields to convert analog signals into digital signals. [0003] There are two common implementations of existing ADCs: delta modulation ADC (∑Δ ADC) and successive approximation ADC (SAR ADC). The ΣΔ ADC adopts oversampling and noise shaping technology, and can easily achieve a precision of more than 12bit; but because its precision is directly determined by its oversampling rate, its conversion rate is greatly limited in the case of a high precision of more than 12bit. Therefore, ΣΔ ADC is difficult to be applied in occasions with high-speed requirements. The conversion period of the SAR ADC is very short, and the N-bit SAR ADC o...

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, in order to overcome the shortcomings of the low speed of the ΣΔ ADC and the large area of ​​the high-speed SAR ADC, the present invention provides an analog-to-digital converter on the one hand, including:

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